My former spouse had a teacher - English, I think? or one of the hard sciences - who convened the class, then promptly walked to the door, flipped the light switches off, turned to the class and said, "Now they're off."

Then he turned back to the switches, flipped them all on (this was all done with a slight flourish), swiveled back toward them, and said, "And now they're on."

Back (off). And forth (on). And back (off). And forth (on). Finally, one of the braver, less dumb-struck students crept toward the door, scampered out, and sought help.

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